There are various tests done during pregnancy to check if the foetus is suffering from any genetic or chromosomal defects. Many blood tests like dual triple or quadruple marker test along with ultrasounds like nuchal translucency and anomaly scans are done to check foetal development and to check if the baby is at risk of suffering from any chromosomal abnormalities. The scores and results of these tests are used to decide if a mother needs to go for more invasive tests. Usually an invasive test would involve going for an amniocentesis which involves taking a direct sample from the baby
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